Stainless Steel Exhaust Header For Acura 90-91 Integra B18 B18A1 B18B Fits for 90 / 91 Acura Integra RS GS LS 1.8L B18A1 engine Made of High Quality T304 Stainless Steel Material Inlet: 1.75" , Outlet: 2.00" TIG Welded CNC Machine Flange Professional Installation is Highly Recommended